ADDTEK AMC7635-3.0

AMC7635
300mA CMOS
LOW DROPOUT REGULATOR
www.addmtek.com
DESCRIPTION
FEATURES
The AMC7635 of positive, linear regulator features low
noise and low dropout voltage, making it ideal for battery
applications. The space-saving SOT-23-5 package is attractive
for "Pocket" and "Hand Held" applications.
„
Guaranteed 300mA Output
„
Accurate to within 1.5%
„
Very Low Dropout Voltage
„
Over-Temperature Shutdown
In applications requiring a low noise, regulated supply,
place a 1000pF capacitor between Bypass and Ground.
„
Power-Saving Shutdown Mode
„
Current Limiting
The AMC7635 is stable with an output capacitance of
2.2µF or greater.
„
Noise Reduction Bypass Capacitor
„
Factory Pre-set Output Voltages
„
Low Temperature Coefficient
„
Available in SOT-23-5 packages
TYPICAL APPLICATION CIRCUIT
VIN
VIN
APPLICATIONS
VOUT
VOUT
AMC7635
CIN
BP
GND
EN
COUT
2.2uF
1uF
CBP
1000pF
GND
„
Wireless Devices
„
Portable Electronics
„
Cordless Phones
„
PC Peripherals
„
Battery Powered Widgets
„
Electronic Scales
„
Instrumentation
VOLTAGE OPTIONS
AMC7635-1.5
AMC7635-1.8
AMC7635-2.0
AMC7635-2.5
AMC7635-2.8
AMC7635-3.0
AMC7635-3.1
AMC7635-3.3
AMC7635
PACKAGE PIN OUT
– 1.5V Fixed
– 1.8V Fixed
– 2.0V Fixed
– 2.5V Fixed
– 2.8V Fixed
– 3.0V Fixed
– 3.1V Fixed
– 3.3V Fixed
– Adjustable Output
VIN
1
GND
2
EN
3
5
VOUT
4
BP
5-Pin Plastic SOT-23-5
Surface Mount
(Top View)
ORDER INFORMATION
TA ( °C )
0 to 70
DB
Plastic SOT-23-5
5-pin
AMC7635-X.XDBFT (Lead Free)
Note: 1. All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC7635-X.XDBT).
Note: 2. The letter “F” is marked for Lead Free process.
Copyright © 2007 ADDtek Corp.
1
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-- SEPTEMBER 2007
AMC7635
BLOCK DIAGRAM
5 VOUT
VIN 1
Over Current
Shutdown
Thermal
Shutdown
EN 3
BP 4
-
AMP
+
R1
VREF
R2
2
ABSOLUTE MAXIMUM RATINGS
GND
(Note)
7V
0 °C to 150 °C
-65°C to 150°C
260°C
Input Voltage, VIN
Operating Junction Temperature Range, TJ
Storage Temperature Range, TSTG
Lead Temperature (soldering, 10 seconds)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
POWER DISSIPATION TABLE
DB PACKAGE:
Thermal Resistance from Junction to Ambient, θJA
220℃/W
Junction Temperature Calculation: TJ = TA + (PD ×θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. Connect the ground pin to ground
using a large pad or ground plane for better heat dissipation. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Min.
VIN
IO
TJ
VOUT +∆V
5
Input Voltage
Load Current (with adequate heat-sinking)
Junction temperature
Copyright © 2007 ADDtek Corp.
2
Typ.
Max.
Units
6
V
mA
O
C
125
DD078_A
-- SEPTEMBER 2007
AMC7635
ELECTRICAL CHARACTERISTICS
VIN = VOUT(Nominal)+0.5V, VIN,MAX = 6V, TA = 25℃ (unless otherwise noted)
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Symbol
VOUT
∆VOUT
∆VIVOUT
∆VOUT
Test Conditions
IO = 1mA
-1.5
+1.5
IO = 1 to 300mA
-2.5
+2.5
IO = 1mA, VOUT + 0.5V < VIN < 6V
∆V
10
70
VOUT(NOM) ≤ 2.0V
330
500
2.0V<VOUT(NOM)≤2.5V
220
350
VOUT(NOM) > 2.5V
165
250
VOUT ≤ 2.0V
1300
IO=300mA,
VOUT=VOUT(NOM)-2.0% 2.0V<VOUT≤2.5V
VOUT > 2.5V
Maximum Output Current
Current Limit
Ground Pin Current
IO
ILIMIT
IQ
Output Shutdown Delay
VOUT > 0.96 × VRATING
300
VOUT > 1.2V
300
mA
400
IO = 0mA ~ 10mA
50
100
IO = 10mA ~ 150mA
100
150
IO = 150mA ~ 300mA
120
180
CBP = 0µF, COUT = 1µF, IO = 100mA
600
0.1
EN “low” Bias Current
IIL
VEN = 0V
0.5
VEN = GND
0.01
1
EN “low” Input Threshold
VIL
VIN = 2.5 to 5.5V
0
0.4
EN “high” Input Threshold
VIH
VIN = 2.5 to 5.5V
2
VIN
PSRR
f = 1kHz
60
f = 10kHz
50
f = 100kHz
40
Thermal Protection
Temperature
uA
µA
V
dB
150
°C
Thermal Protection
Temperature Hysteresis
30
Note 1:
For the adjustable device, the minimum load current is the minimum current required to maintain regulation. Normally the current in
the resistor divider used to set the output voltage is selected to meet the minimum load current requirement.
Note 2:
These parameters, although guaranteed, are not tested in production.
Copyright © 2007 ADDtek Corp.
µA
µS
VEN = VIN
IO=100mA
CBP=0.01uF
COUT=2.2uF
mV
600
IIH
Power Supply Rejection
Ratio
mV
900
EN “high” Bias Current
Shutdown Supply Current
%
0.15 0.35 %/V
1mA ≤ IO ≤ 300mA
IO=150mA,
VOUT=VOUT(NOM)-2.0%
Dropout Voltage
Min Typ Max Units
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AMC7635
CHARACTERIZATION CURVES
Unless otherwise specified, VIN = 5V, CIN = 1µF, CBP = 0.01uF, COUT = 2.2µF, TA = 25 OC.
VIN=5V, CIN=1uF, COUT=2.2uF, CBYP=Open
RLOAD=10Ω
Output (1V/DIV)
Output (1V/DIV)
Enable (2V/DIV)
Chip Enable Transient Response
VIN=5V, CIN=1uF, COUT=2.2uF, CBP=1000pF
Enable (2V/DIV)
Chip Enable Transient Response
AMC7635-3.3
RLOAD=10Ω
AMC7635-3.3
TIME= 1 ms/DIV
TIME= 1 ms/DIV
Short Circuit Response
Over Temperature Shutdown
VIN=5V, CIN=1uF, COUT=2.2uF,CBP=0.01uF
VIN=5V, CIN=1uF, COUT=2.2uF,CBYP=0.01uF
RLoad =100Ω
RShort =0.1Ω
RLoad =6.6Ω
VOUT (1V/DIV)
VOUT (1V/DIV)
IO (1A/DIV)
IO (200mA/DIV)
AMC7635-3.3
TIME= 20 ms/DIV
TIME= 400 ms/DIV
Load Step (1mA~300mA)
Line Transient Response
VIN=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF
VIN,AVE=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF
VIN (1V/DIV)
IO= 1mA ~ 300mA
VO (10mV/DIV)
IO (200mA/DIV)
VO (10mV/DIV)
AMC7635-3.3
TIME= 10 ms/DIV
Copyright © 2007 ADDtek Corp.
AMC7635-3.3
TIME= 2 ms/DIV
4
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AMC7635
Ground Current vs. Input Voltage
Ground Pin Current vs. Tem perature
90.00
75.00
60
85℃
Ground Current(uA)
Quiescent [email protected] 3.5V (uA)
62.5
57.5
55
52.5
60.00
45.00
25℃
30.00
15.00
50
0.00
-45
-20
5
30
55
0.0
80
1.4
2.8
4.2
5.6
7.0
Input Voltage(V)
Temperature(℃ )
Sofe Operating Area
Drop Out Voltage vs. Load Current
400
600.0
VOUT=1.5V
VOUT=1.8V
Output Current (mA)
Dropout Voltage (mV)
500.0
VOUT=2.0V
400.0
300.0
200.0
100.0
VOUT=2.5V , VOUT=3.1V,
VOUT=2.8V , VOUT=3.3V,
VOUT=3.0
0.0
0
50
100
150
200
250
300
TA =70℃
200
TA =25℃
100
0
300
0
1
Dropout Voltage vs. Tem perature
3
4
5
6
7
Drop Out Voltage vs. Output Voltage
600.0
400
500.0
Dropout Voltage(mV)
Dropout Voltage @ 300mA (mV)
2
Input-Output Voltage Dif f erential (V)
Load Current(mA)
350
300
250
400.0
Io=300mA
300.0
Io=200mA
200.0
Io=100mA
100.0
VOUT = 3.3V
I OUT = 300mA
0.0
200
-45
-20
5
30
55
1.5
80
Temperature(℃ )
Copyright © 2007 ADDtek Corp.
1.8
2.0
2.5
2.8
3.0
3.1
3.3
Output Voltage(V)
5
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AMC7635
Pow e r Supply Re je ction Ratio
Pow e r Supply Re je ction Ratio
70
60
Io=100mA
CIN =1uF
60
COU T=2.2uF
50
CBP=Open
Io=300mA
40
40
PSRR(dB)
PSRR(dB)
50
Io=1mA
Io=10mA
30
30
Io=1mA
Io=100mA
Io=10mA
20
20
C IN =1uF
10
C OU T=2.2uF
10
C BP=0.01uF
Io=300mA
0
0
100
1K
10K
100
100K
1K
10K
100K
1M
Freqency
F reqency
Pow er Supply Rejection Ratio
70
CIN =1uF
CBP=10nF
COUT=2.2uF
60
Io=100mA
PSRR(dB)
50
CBP=1nF
40
CBP=100pF
30
20
10
CBP=Open
0
100
1K
10K
100K
Freqency
Copyright © 2007 ADDtek Corp.
6
DD078_A
-- SEPTEMBER 2007
AMC7635
APPLICATION INFORMATION
V IN
V IN
V OUT
V OUT
AMC7635
C IN
BP
GND
EN
C OUT
2.2uF
1uF
C BP
1000pF
GND
Š Detailed Description
The AMC7635 CMOS low dropout regulator contains a PMOS pass transistor, a voltage reference, an error
amplifier, over-current protection, and thermal shutdown circuit.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision
reference. T hermal shutdown and over-current circuits become active when the junction temperature exceeds
150℃, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation
is restored when the junction temperature drops below 120℃.
Š External Capacitors
The AMC7635 is stable with an output capacitor to ground of 2.2µF or greater. Ceramic capacitors have the
lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the
highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively
expensive. One option is to parallel a 0.1µF ceramic capacitor with a 10µF Aluminum Electrolytic. The benefit is
low ESR, high capacitance, and low over-all cost.
A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be
at least 0.1µF to have a beneficial effect.
A third capacitor can be connected between the BP pin and GND. This capacitor can be a low cost Polyester
Film variety between the value of 0.001 ~ 0.01µF. A larger capacitor improves the AC ripple rejection, but also
makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges.
All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This
can be achieved with a "Star" connection.
Š EN
The EN pin is normally pulled to high. When shutdown, pulled low, the PMOS pass transistor shuts off, and
all internal circuits are powered down. In this state, the quiescent current is less than 1µA. This pin behaves much
like an electronic switch.
Copyright © 2007 ADDtek Corp.
7
DD078_A
-- SEPTEMBER 2007
AMC7635
PACKAGE
5-Pin SOT-23-5
SEATING PLANE
D
INCHES
b
L
E
MIN
L1
TYP
MAX
MIN
TYP
MAX
A
-
-
0.057
-
-
1.45
A1
-
-
0.006
-
-
0.15
A2
0.035
0.045
0.051
0.90
1.15
1.30
b
0.012
-
0.020
0.30
-
0.50
c
0.003
-
0.009
0.08
-
0.22
E1
c
e
L2
e1
M
GAUGE PLANE
D
0.110 BSC
2.80 BSC
0.063 BSC
1.60 BSC
e
0.037 BSC
0.95 BSC
0.075 BSC
0.012
L1
A1
M
8
0.018
1.90 BSC
0.024
0.30
0.024 REF
L2
°M
Copyright © 2007 ADDtek Corp.
2.90 BSC
E
L
A2
0.114 BSC
E1
e1
A
MILLIMETERS
10°
0.60
0.60 REF
0.010 BSC
5°
0.45
0.25 BSC
15°
5°
DD078_A
10°
15°
-- SEPTEMBER 2007
AMC7635
IMPORTANT NOTICE
ADDtek reserves the right to make changes to its products or to discontinue any integrated circuit product or service
without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing
orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe
property or environmental damage. ADDtek integrated circuit products are not designed, intended, authorized, or
warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of
ADDtek products in such applications is understood to be fully at the risk of the customer. In order to minimize risks
associated with the customer’s applications, the customer should provide adequate design and operating safeguards.
ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of
its products to the specifications applicable at the time of sale.
ADDtek Corp.
9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105
TEL: 2-25700299
FAX: 2-25700196
Copyright © 2007 ADDtek Corp.
9
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-- SEPTEMBER 2007